Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '8152df30d2263887a02f4a0041a1d65221efc9b5b34253ae0c218705c0db4be6' 
  AND token = 'vshCbOf7kw1deLBT9L4dGflr+j0c7/PL+O7U8VElFV0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00045

JSON explain

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