Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'e373ec6ff34dd2e722b4218bb309290f781a0337c37e57e75a6c5f5a4d0904df' 
  AND token = 'PFDFc4pd8ze6njnRMxSK6uCc2xQZP+qfGPmV9UqQ3Cs=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00045

JSON explain

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