Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '18e3398a75adeaaa74946c4c04d2648f64352838d4320555c3d9263c4a896581' 
  AND token = 'ZQvt9g4VQ1crPU1khBAdolsqmg+dhUr9/r6wQ5EsULg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00027

JSON explain

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