Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '1f6c2f759d6805843c4b0e770b46910a0e7d8e38c1562c7b00c58642de261243' 
  AND token = 'cD2g/de6utfhb8Kkt1WLX580xkhDEO/kzNYr/R0XQtE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00026

JSON explain

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