Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '7b7877f2dc196c1e529d63dfe3c20a742573f74ecafe6a0228bee9dc8f5ccc97' 
  AND token = '35SBFz3ZHTeVOemVgSrNYDFWJzVlJScJ2ODYH90Mnf4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00038

JSON explain

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