Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'f2ca74462ac58591c14e7a3d5074c2dc8e1f7d61595aa2e9606b1dcb4aa06540' 
  AND token = 'Vx4GcpUsaUywLblQS/VemdBcarkeZ9LqCeSr9M9QY9U=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00018

JSON explain

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