SELECT 
  1 
FROM 
  cscart_june_setuplock_keys 
WHERE 
  key_id = 'c84f9f0dd85f28c3b51858e67870c9724a319d66d202f3cb4819c7d786732d74' 
  AND token = 'dAxTJhJOTGLNXUvMQdng+KsYCN8NUjQlR3jCt1SN5gU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00128

JSON explain

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