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SELECT 
  1 
FROM 
  cscart_multi_declock_keys 
WHERE 
  key_id = '71b622bfeb4a141aa246c72541a2cd759455ac4a29f5ef435aaef921f027c2cc' 
  AND token = 'LrLbYelTdqbcqt41R1gTmLUHwXyKxHlQgDnj5KtmhF8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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