Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '636455ca2a2a101aeb63e7311658436e23ec3932a40a3ed239f7a68d4e91c212' 
  AND token = 'x5j/8dmiq0l0uxxJDRxRNZ1TFeWG8HpoKASPXCFDo0I=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00021

JSON explain

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