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SELECT 
  1 
FROM 
  cscart_june_setuplock_keys 
WHERE 
  key_id = '7ed93ebf582ec1bcaf1db9053b173389f2b254fce48879a66b19cbe1b15b6c31' 
  AND token = 'YtnM8RXDKmmySf0YNxSj5BJd6wcO+ZySgZgnqy9oS9g=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00025

JSON explain

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