Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '68d43b62585aba54af9f2c1877d0cfea812609e29b485f4bdd303b35c09f4fc1' 
  AND token = 'dnyMMW2XaIFB3x1i4xfDWDnEKHy9UGMeTwsPQzqNYXs=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00040

JSON explain

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