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SELECT 
  1 
FROM 
  cscart_multi_declock_keys 
WHERE 
  key_id = '88f671d1536e1e1e099bfb5c4e76a3ad48ec66f9278ef128b0675f5578ba3026' 
  AND token = 'zzyvPZE10QXFRNNFZRpP6pzJ5GdDCCiX56eFizttjBY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00027

JSON explain

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