Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'abb9f6929244f788fd7a9f054a8f3b5c5dc1c9ccf28ba70c295e519bb372c624' 
  AND token = 'OXI2soREdMYfr1rgSeHod1SIsXZ1BLjb45nUuc2KTr4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00042

JSON explain

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