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SELECT 
  1 
FROM 
  cscart_multi_declock_keys 
WHERE 
  key_id = '27b7ae70f33054f9354191189fea50616dea65e6512b7a5a0cd5e4fea8140374' 
  AND token = 'Z+hoCc8EbKez7Bt8Hgahp0jWgXHRQ2+iTKNQsMQoe/o=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00028

JSON explain

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