Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'e8ff66c7cde0838beb79269c198c7ac56f9e16d280b6bc887c380d368f6a026a' 
  AND token = 'aWjSRqMHiFBlC8PKIIkC8I43przt9RG+kaG0sBr8/NI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00032

JSON explain

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