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SELECT 
  1 
FROM 
  cscart_june_setuplock_keys 
WHERE 
  key_id = '67738beb9c5b56c341b3ac5cca917ba0b3bf0d2dc127faf4a2bc4f463d7e77e4' 
  AND token = 'yL1WT1rv3s/bIxb64QPQbBJDUoDRQqW0w9TcT9Wa2o8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00023

JSON explain

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