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SELECT 
  1 
FROM 
  cscart_multi_declock_keys 
WHERE 
  key_id = '0fb7d6e99bed98b92892055330d00e379eaf7582442cc170bb3bb9ae3c70a481' 
  AND token = 'n1xTo2eExYEiUCg2cX8SM1gXDQuUJvw0heP/lZ1bG/w=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00024

JSON explain

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