Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '07b918b80a1fea6cd557317ae09a1b4b76aaaca5a83bba016cf6bb8f18db8dd6' 
  AND token = 'nR1Drv4PEyCijZCaqg7xjlj2v7NqRJPecVHLhwQF3Gw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00018

JSON explain

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