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SELECT 
  1 
FROM 
  cscart_multi_declock_keys 
WHERE 
  key_id = 'a01c28028ab4013540fff30615b85d2a71a68139b5511b855c4056fbd9f301cc' 
  AND token = '0lEo64RVSbcS8T0rtt16YBzd9qg/9d9bG+jHsnNYwG8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00042

JSON explain

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