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SELECT 
  1 
FROM 
  cscart_multi_declock_keys 
WHERE 
  key_id = '003e3c287d2809fb6bbb6e38c192f476f771de13b43649caefbbd7e49b508580' 
  AND token = 'Sd64CrfGcsVU4jEPPS+Gr5i6hs5Fmd9RjRh4UsJz7S8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00034

JSON explain

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