Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '17b0672288ad6e6dc2597dc11d9f820c03ac0d7a6fb9507251d2c6b2c829f6a6' 
  AND token = 'rpdNPFofdYgA6GhPzKMsSFWCkt1DDz6mUHvICJvUCfk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00027

JSON explain

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