Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '5ebd973843f2676cd2008ad130f2d4f8f026d9a190cb19197947b78d3121e4a3' 
  AND token = 'KXZue09ZPFDrnva7U+i+1KbIwIhLNnUB4jcOWlnyl9Q=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00027

JSON explain

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