Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '3a1fc9eeaca0f857abeaa3a92c8a692f1d24f25c5f2e35fa675dcf217e6565da' 
  AND token = 'rSVSvL1i8MSfsTBgj237wLVQKIwkaMQo9J+M+5ziZjE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00036

JSON explain

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