SELECT 
  1 
FROM 
  cscart_june_setuplock_keys 
WHERE 
  key_id = '8a95603f0ee208934642089f56844426983897cfe32c8aa8064c3cd7b583dc4a' 
  AND token = 'uSae+tHd29YlxrKMvZCKRC2gghhEPij1yrOE1F9Viiw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00038

JSON explain

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