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SELECT 
  1 
FROM 
  cscart_multi_declock_keys 
WHERE 
  key_id = 'faeeef932798c0cf64398ca042d6529b6993a7d0c4e8a6f2ef70d5338c5757cb' 
  AND token = 'gxt8WzYr3bHweY5zAMTlGUu1GRn8D/5m2KcEDivubPc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00025

JSON explain

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