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SELECT 
  1 
FROM 
  cscart_multi_declock_keys 
WHERE 
  key_id = '1277becf2b1cb61455862b6eae8d8bcf9d1d113b62b1c98d3cadd326d55a0239' 
  AND token = 'G71wS8rvx8UocL4O/6ihSqd8LG57vsZc2Ix+0h5Jfm8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00037

JSON explain

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