Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'e4e555a270374c0c0e6843cbefa533f3fe1e67b931abb324c66c906e8026f778' 
  AND token = 'M6pp+dshP4dMUjr5Zs23sgZXqNiv4MrQB+AsB0IOxiQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00024

JSON explain

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