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SELECT 
  1 
FROM 
  cscart_multi_declock_keys 
WHERE 
  key_id = '9289b9985d044f1a1ce73c457d5983ef06690f2f9fb63eec0b8c6ae3590ee84d' 
  AND token = 'DjxNPlnwqEu9T82Z81QKcQhZoEzM7eKqk9cSFKhNT2U=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00032

JSON explain

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