Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'd7c8ae0a3b9b2782798d21f59fdbcdf6edacfd94d86f203f1161ba40a2987f52' 
  AND token = '87v5wP4Armu0XvHMhpfBjHtRM/B3IeFaoNNfwfVXNEk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00030

JSON explain

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