Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'e152fa2ac0e9c9175686179560d9c70cf851078de2068c8f5ef7d669bacede42' 
  AND token = '6+MuhIRRzstBFIN/LTKSUofCXaXk0E/I2K09TL3uVpc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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