Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '7f42d696d6abfd4fdd786fe8ff21fa7d3f452bdd8ec309a52841bb9a8d19da79' 
  AND token = 'aTtUEo2sjtq+USwxj99K8tMOqfIOMzXYI+lQzi1awB4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00026

JSON explain

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