Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '3cacb1833d2a59af69f8872ae330dbe2545c15867b8ebfd1fee704a81a2c2c42' 
  AND token = 'zVGeI+Cnrv2e8X5QmE9vqcfehoRpJz9oOqhXHpVKy2c=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00041

JSON explain

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