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SELECT 
  1 
FROM 
  cscart_multi_declock_keys 
WHERE 
  key_id = '30a38c2d5e90dc0d2f6d6d3d962e2bf27886b15ad2b95e49e1400710081eab24' 
  AND token = 'kue/AKPKx2A7gaBvD6JIzhmQq7SoluloIg67ES/zmd4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00023

JSON explain

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