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SELECT 
  1 
FROM 
  cscart_multi_declock_keys 
WHERE 
  key_id = '993ebc96edd91d60477da4ea84048a44bbb8de86846eb8ca045aa1636a0e051c' 
  AND token = 'oAO7t8UyBI7v5TOtF+KH7XjgOIDxEqZHw2p2BwR9PxI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00025

JSON explain

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