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SELECT 
  1 
FROM 
  cscart_june_setuplock_keys 
WHERE 
  key_id = 'f77e89d7d2ba872e0ae3977a23d2cfc09fe4ec1e153bf2b60a195052e5f1fa2c' 
  AND token = 'QHNbP5wrnEX+jQ6wYxsNUcEFybgryQ1mZPmyy0rpytI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00020

JSON explain

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