Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'b2c8385e67e5ff62d3127a3ee1177b01154522bca810a6eef7a36f6aeeb05887' 
  AND token = '+DuQ3w3DxS1RnhGVqHmKwnUjL5AH9XntrThremqiBCQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00022

JSON explain

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