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SELECT 
  1 
FROM 
  cscart_multi_declock_keys 
WHERE 
  key_id = '602b6b301e794daee89e03dacd82d884aee7a085ca34a000c34ef8966a4bc7d5' 
  AND token = 'sD+LiAXYGJgU+qBCWzS2pygD7bMNLBbeROICr1E8v5k=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00033

JSON explain

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