Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'b4b57ecddefacfd492ce802882e248d46164ca0db4072ebfde7623263b6f3d43' 
  AND token = 'L1W5CGFKTdQrTibDMV0cXtvVONOpdW8T78nopjgYWik=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

{
  "query_block": {
    "select_id": 1,
    "message": "no matching row in const table"
  }
}