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SELECT 
  1 
FROM 
  cscart_multi_declock_keys 
WHERE 
  key_id = 'a22da1c175a698d9a91eb3f79f258de9a204c8176c028c21c587f30e2c30f3d0' 
  AND token = 'DwHlEru3tt320qzrvsv3h0rJyx7MwAmQ1vrP9ATeIrw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00030

JSON explain

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