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SELECT 
  1 
FROM 
  cscart_multi_declock_keys 
WHERE 
  key_id = '5f8d2f06bdba3d0825ad70d8c4debd24d11e6032cf1633f742030546440fa086' 
  AND token = 'Zv9eiSBdgiIswrKb302FZCwZ/fF1/HsDfUC4gbRHSiY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00030

JSON explain

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