Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'e71f3567693f28e4a127732c996ab8dd0a24080c85b220683d48df8ea1227bdf' 
  AND token = 'yaUNwSPUy2Kevw89XVkZ3CHDAnbvqlnCEQx2jZgB3eY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00027

JSON explain

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