Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '44b56527c092d323937ef39e863b12538ee1967358dbcb7fe9e1329d2ae24d74' 
  AND token = '8qEdFnQ2hmaP0LdCHnPZeYRLh+RTm3Ot63oCsUXUFVg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00021

JSON explain

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