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SELECT 
  1 
FROM 
  cscart_multi_declock_keys 
WHERE 
  key_id = '67e98e5c98dbc68c03baabae216df3b0860efe39b8b31e72afaeb3b2a5c0c434' 
  AND token = 'bSqHWYbEe3IV0rD+qJtvrUhdsiQGwGAoIBrjYlUaUQw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00028

JSON explain

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