Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '6b9fc7dcc6668935881fca92312c968fac8568aaeee1ba77e3d0725e40f39e13' 
  AND token = 'Mu8c/ogCpQphXxNmxkDaMRK3ZcQoE0NUYP5QhdOdZX4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00043

JSON explain

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