Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '38270d471c8ea2029e814ab7b7b70e154bf9b37d7a4e9f2463134e815cc3c150' 
  AND token = 'Q8E0hmvhoI+zyV99ksodQJCaDPdLmsQyM/np2ryMYmQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00038

JSON explain

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