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SELECT 
  1 
FROM 
  cscart_multi_declock_keys 
WHERE 
  key_id = '32de497376d40b25f75fb6c33ccfba6efa613eea8e13a0c8a5752aa3ee000c91' 
  AND token = 'LBEWHQ2XoI03rSR45dqcOWwim4nDB+n9Z6nmS5dnKXI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00024

JSON explain

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