Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'ad8765cff43e0e0a667525a6c84e340a0b24423f0ce2d08b9fee708fb213a8c4' 
  AND token = '/IJhvSb2mTi63IkqLmE0iYTzGD4/n4of9IqZ/1vRpIo=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00017

JSON explain

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