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SELECT 
  1 
FROM 
  cscart_multi_declock_keys 
WHERE 
  key_id = '910e7969df545e64f8e1e42d011e7fa869e8b1d79f5790e3ac9c1002fa54ace3' 
  AND token = 'dvBeAklRGLDBCm4cp92Quuxn8NoWjWTODCqcgIP1OEY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00021

JSON explain

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