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SELECT 
  1 
FROM 
  cscart_multi_declock_keys 
WHERE 
  key_id = '4631514bdb2ecdac72c9feb4504b1800c3ca85eb92ddacd9c3961df442f2bbc0' 
  AND token = 't3WfEps0WCrQk/4OtYCQqBWFI5yhws/gbWkyHyf992g=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00017

JSON explain

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