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SELECT 
  1 
FROM 
  cscart_multi_declock_keys 
WHERE 
  key_id = 'eca85f22e2667bd92a43f7789653f906e5e47bec2a84c0f30b36254945d7b228' 
  AND token = 'blBAmCNpMVe4+FkzAbnPime6VFLj1bJ7HdZloiAB0fw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00039

JSON explain

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