Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '3bd66279099c4786f7fa0612d5377722956eb218643f60eddde69d348a0f59d5' 
  AND token = '/a/OWji3v3sQSNGzuME3E2Rc63E15bCHDtvGCeuHrfQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00027

JSON explain

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