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SELECT 
  1 
FROM 
  cscart_multi_declock_keys 
WHERE 
  key_id = '3b58d0d77a85aad259be048c2edde2616821c3fd00c0fffcf409ce5fafec4e96' 
  AND token = 'MQM61Mcvetfm0/8KhG10kyLOl3NryZcp/EgMQCq/hYI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00025

JSON explain

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