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SELECT 
  1 
FROM 
  cscart_multi_declock_keys 
WHERE 
  key_id = 'dca1d86276b6480358369c8325aaa7f85192d58bd233bf7fc7c59f69f9496dc4' 
  AND token = 'b7akD/58TuevlleaAxfUuEq3vn5AZecHU088ItjKrqI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00022

JSON explain

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