Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '7a72324f41dbb3b38cf7fc9df45c057afe7f748b1ad075594d36634214f26405' 
  AND token = 'LdLdAn08ecEq8QqTq2Q7DqWgkzbY2R12ag6JsRwG+5M=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00033

JSON explain

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