Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '4daaff4bb2b058faff7685fd3cce179be724001cb9484137087067cade7fe7cf' 
  AND token = '3a/uXvzlNE5coPLac/b5yRPiO6K1yfMO62+txbWymKI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00025

JSON explain

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