Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '91347cc845293f29441dd125f8be8313fabb1b63ae335807a3108e784a1aeb86' 
  AND token = 'euLBDV9TMsnIzniktXISnnt9udUDxSlbqX+tkGiv1eY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00028

JSON explain

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