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SELECT 
  1 
FROM 
  cscart_multi_declock_keys 
WHERE 
  key_id = '3f311343595cd93337bba599ab79b8a756a19b24ffc78e6c534728f8958f1b1e' 
  AND token = '9e7HiemXl/31j8mUcZZENX0DCVqR6goVQx8rFOUrzxs=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00027

JSON explain

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