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SELECT 
  1 
FROM 
  cscart_multi_declock_keys 
WHERE 
  key_id = '6b4ab42ebb5dff7ed6a996929922ce132892706a14cf606ff566cdb03c90cdc2' 
  AND token = 'RdpY6k0YVO3JnbXA+W1e/ncWZEVApXo+PxpPLfBazoQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00030

JSON explain

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