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SELECT 
  1 
FROM 
  cscart_multi_declock_keys 
WHERE 
  key_id = '26c0225c06b390e46a7a0faccf1b799c7b2958f6c54da2b6df56241318aec62c' 
  AND token = 'ipeedczycX46dvT2obA0++6kjTWkHQxDvcLwogDRcqw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00021

JSON explain

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