Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'ee37102a63acfcf7f968297fbeada14029e2cbd584aa290c717299d993246c38' 
  AND token = '5xxReLAkFOvgCVwrK8WegcTm1KBE5kZBF6yaQN56uG4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00043

JSON explain

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