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SELECT 
  1 
FROM 
  cscart_multi_declock_keys 
WHERE 
  key_id = '28000ca07f7cab8fab1e95e1dcffca0bfd8c4addadbc6a3355d40fe18046fe8a' 
  AND token = 'fGMnYiafWLFbi/NTlxFvOeholYTaNMur/TLF2tLxT3U=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00042

JSON explain

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