Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '99d3415877419fe059e92549dce376a47719cf04bab34da3f5ca2b0fbb483f5b' 
  AND token = '7mhsM9uS00TBNksy3ShRDOtvd06Hm0IvENvluRMkI1Q=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00036

JSON explain

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