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SELECT 
  1 
FROM 
  cscart_multi_declock_keys 
WHERE 
  key_id = '9c244f56bfd6ab8bcc9972ceda8286d29416d5dac20fd26b88786161af3143a8' 
  AND token = 'IW5soHx6AOMzUg4MyP333MLSkK7m6FEcD3vSnxFuPuw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00023

JSON explain

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