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SELECT 
  1 
FROM 
  cscart_multi_declock_keys 
WHERE 
  key_id = '4dc26cba9879933bdc499ed70120d41630b24ace9ca79358d690c008ebacfe19' 
  AND token = '2kuj/0QO9CWpkO/UHk2BgwCfYpGLZL75ZEbcp/1fZM0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00022

JSON explain

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