Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'd530f885cc0c9f775014dfe55f50c0d54b355aa1d6d1684137c3eb0df7bdb0d0' 
  AND token = 'W2Khkyn2Ih2X2Hv9rX+lcmwi+k1+ZhqIOUJJownhM+s=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00053

JSON explain

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