Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '9b94ae130a97c37b04fe482fd4dd2cffa53207faeb4a4fb2eb3c188d4a08b029' 
  AND token = 'n7ddLuDxctMBfnAz1djwVq2LGal2eroUVgsXfAPgykk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00044

JSON explain

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