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SELECT 
  1 
FROM 
  cscart_multi_declock_keys 
WHERE 
  key_id = 'b4cc11ba9b14d6785ae0bbe426feb607c8927161fcd47eaec9b297cb308311b5' 
  AND token = 'sVfKSIkoMSHL4Mg9KfgIdnNXc+bRDrrwMXabzPg22YI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00018

JSON explain

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