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SELECT 
  1 
FROM 
  cscart_june_setuplock_keys 
WHERE 
  key_id = '494579c7d7caa895432a4b0979aeec908915aa7e665fa68a12be8ffcec3842ca' 
  AND token = 'UlDG1ZipZQX11iETkYKCMsGI9OW9l7b9UDbdC5B6dJ4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00037

JSON explain

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