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SELECT 
  1 
FROM 
  cscart_multi_declock_keys 
WHERE 
  key_id = 'fa50f64e43250180ba65aefd238f518b587d9aa70915dc6e03b82f6e44aed3b2' 
  AND token = '2nBXcp9m+QSZRD5jbVedfOL4lcVId/uESmzHeTL28zU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

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