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SELECT 
  1 
FROM 
  cscart_multi_declock_keys 
WHERE 
  key_id = 'e89746cea57ead5718bfab9b4d92a917acc8b0b65d79d3f9fa0483f3741fd81c' 
  AND token = 'VfZsKhznsCG6A5OTUvOw+MlZKuitIbDuie2V6sR60WE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00025

JSON explain

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