Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'f3ba37903350050fadd348ace1ed19c120e76dd585237fce354949727c332f0e' 
  AND token = 'RM0oqQsHv5QFM3r9bdPXwykuF2F5yFERadBJypT7Eog=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00033

JSON explain

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