Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '255cabe99b8068e711604c331e68570bdfe5508b30bf98d7a3a1631781f153bc' 
  AND token = 'RdgHWBwHXDcpsEGs2eb7dWc4ridzg9+KbxBY3gQSo90=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

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