Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'b7043cca411296f05ac17bf3d32e4a08772a4896ccbebe5e56fdceae28e64d70' 
  AND token = 'OwkfzS2gKVz4vbRNUDdbUkgpxnoDQGMRcj+Iz8SnDWk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00024

JSON explain

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